All finishers of the OneAmerica 500 Festival Mini-Marathon will receive this 2013 medal when they cross the finish line.

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The OneAmerica 500 Festival Mini-Marathon has more than 5,000 open spots for the 37th annual race in four months on May 4.

The 13.1-mile race has sold out for the last 11 years, as early as November. But the growing number of half-marathons in the spring in the Midwest has given runners and walkers many more options in recent years.

"We sold out last year at the end of January," said Megan Bulla, 500 Festival communications manager. "This time of the year is a peak registration period for us, as people are planning their race schedules and beginning to train." ...